MicroPython Block Device Question

[Eric24]

I have never seen MicroPython (or the Pycom implementation, to be specific) try to read or write more than one 512-byte block at a time from a mountable device (i.e. something os.mount understands), even though the readblocks and writeblocks functions provided by the device can supposedly support this. As a result, I have no way to test a multi-block read/write. Can anyone confirm that only single-block operations are ever done? If so, then I don't need to test the multi-block code, and will probably just remove it from the device driver.

PS - I don't believe the relevant source code is available (or I'd verify this myself), but if it does, please point me to it.